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	<title>undefined</title>
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	table,thead,tbody,tfoot,th,td{border:1px dashed gray;}
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<table>
	<caption>学生成绩表</caption>
<tr>
	<th>姓名</th>
	<th>性别</th>
	<th>成绩</th>
</tr>
<tr>
	<th>张三</th>
	<th>男</th>
	<th>250</th>
</tr>
<tr>
	<th>李四</th>
	<th>男</th>
	<th>520</th>
</tr>
<tr>
	<th>平均分</th>
	<td colspan=”2”>385</td>
</tr>
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